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This article in AJ

  1. Vol. 63 No. 6, p. 931-934
    Received: June 21, 1971

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Yield of Wheat and Soybeans and Oil and Protein Content of Soybean as Affected by Fertility Treatments and Deep Placement of Limestone1

  1. G. D. Jones and
  2. J. A. Lutz2



Plow sole placement (30.5 cm deep) of dolomitic limestone at rates of 0, 22.4, and 44.8 mt/ha was compared with wheat (Triticum aestivum) grown on Tatum silt loam in 1969 and followed by soybeans [Glycine max (L.) Merrill] in 1970. Treatments consisted of 0, 12.2, 24.4, and 48.8 kg P/ha without K; 24.4 and 48.8 kg P/ha with 23 kg K/ha; and 48.8 and 97.6 kg P/ha with 46 kg K/ha with each rate of lime. The P and K treatments were surface-applied and disced in.

Wheat and soybean yields were increased by P and K treatments but not by deep lime placement. Placement of lime on the plow sole increased the oil content from 23.02 to 23.49% but did not affect the protein content of the soybeans. Differences among P and K treatments in oil and protein contents of the soybeans were highly significant. The P contents of soybean leaves were unaffected by deep lime placement, but the K contents of soybean leaves were decreased with increased lime rate.

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